Carrier for band-tensioning pulleys



Oct 26, 1954 E. ROGNER CARRIER FOR BAND-TENSIONING PULLEYS 3Sheet's-Sheet 1 Filed Oct. 26 1950 Inventon w A w,-

Oct. 26, 1954 RQGNER CARRIER FOR BAND-TENSIONING PULLEYS 3 Sheets-Sheet2 Fil ed Oct. 26, 1950 Int/enter:

Oct. 26, 1954 E. ROGN ER 2,692,474

CARRIER FOR BAND-TENSIONING PULLEYS Filed Oct. 26, 1950 s sheets-sheet sInvemor:

Patented Oct. 26, 1954 UNITED STATES ATENT OFFICE Ernst Rogner,Stuttgart-Bad Cannstatt, Ger- SKF Kugellagerfabriken many, assignor toGesellschaft mit beschraenkter Haftung,

Schweinfurt, Germany, a limited liability com- Application October 26,1950, Serial No. 192,184

9 Claims.

The present invention relates to a device for guiding and tensioning aband, more particularly in textile machines.

It is an object of the present invention to render the impacts verysmall to which the carrier of the pulley guiding the band is subjectedwhen the band is caught.

It is another object of the present invention to reduce the kineticenergy of the carrier in catching the band.

It is a still further object of the present invention to reduce therocking motion of the carrier.

It is still another object of the present invention to provide thelimiting stops for the rocking motion of the carrier at the support ofthe .same.

It is still another object of the present invention to define theposition of the carrier in the longitudinal direction of the machine.

The invention comprises in its broadest aspect a pulley for guiding theband, an elongated carrier member having a resilient portion, firstattaching means attaching the pulley to one end of the elongated carriermember rotatably relative to the same, a support member, secondattaching means attaching the elongated carrier member in the region ofthe other end thereof to the support member turnably about an axis beingparallel to the axis of turning of the pulley, and tensioning meanspermanently tending to turn the elongated carrier member together withthe pulley about the second attaching means relative to the supportmember.

Preferably a weight acts on the resilient carrying member for moving thesame into band-tensioning position.

In an alternative embodiment of the present invention resilient meansare arranged between the support and the carrying member for moving thesame into band-tensiom'ng position.

According to certain embodiments of the present invention the supporthas a circular .crosssection and a stirrup connected to the carriermember has prongs embracing the circular support.

In one embodiment of the present invention the support having a circularcross-section is provided with two holes being parallel to each otherand in axial alignment and a stirrup-like member having ends arranged inthe hole embraces with its mid-portion the carrier member while ahelical spring wound around the support has an end acting upon thestirrup-like member and the carrier member so as to move the same intobandtensioning position.

In a preferred embodiment of the present invention the pulley isconnected to a U-shaped strip by means of a bevelled intermediateportion connected with the smaller end face thereof to one end of thestrip so that the ends of the U- shaped strip delimit wedge-formedspaces for .catching the band.

The novel features which are considered as characteristic for theinvention are set forth in particular in the appended claims. Theinvention itself, however, both as to its construction and .its methodof operation, together with additional objects and advantages thereof,will be best understood from the following description of specificembodiments when read in connection with the accompanying drawings, inwhich:

Fig. l is a side elevation partly in section of a first embodiment of acarrier for the tensioning pulley;

Fig. 2 is a plan view partly in section of the middle portion of thedevice shown in Fig. 1;

Fig. 3 is a side elevation partly in section of another embodiment ofthe carrier, only the lower part of the same being shown;

Fig. 4 is a plan view partly in section of the device shown in Fig. 3;

Figs. 5 and 6 are a side elevation and a plan view, respectively, partlyin section, of a further embodiment of a carrier for the band-tensioningpulley, only the lower part of the carrier being shown;

Fig. 7 is a front elevation of a still further embodiment of a carrierfor the band-tensioning pulley, only the middle portion .of the carrierbeing shown;

Fig. 8 is a section along the line 18-8 of Fig. 7;

Fig. 9 is a side elevation partly in section of the device shown in Fig.7; and

Figs. 10, 11 and 12 are, respectively, a side elevation partly insection, a front elevation, and .a plan view partly in section, of astill further embodiment of the present invention.

Referring first to Fig. 1, it will be seen that on one end of thecarrier rod 26 the holder [8 is mounted which in turn rotatably carriesthe tensioning pulley I 2 about which the band Ill passes. This carrierrod 25 is a relatively thin circular rod having a mid portion passingthrough a recess 52 in a rod-shaped support ,54 forming a stationarypart of the machine. A stirrup-like member 55 holds the mid portion 50of the car.- rier rod 26 in the recess-i2 and is provided with twoprongs 58 embracing the support 54 v(see also Fig. 2). The upper portion,of the carrier rod between holder l;8 and support 54 is resilient forvibration in the plane of turning of the carrier 3 line. The lower end60 of the carrier rod 26' carries a preferably adjustable weight 62which acts on the carrier 26 so that the pulley I2 is acted upon by theholder I8 in a direction tensioning the band I0.

The operation of this device is as follows:

Small movements of the rod-like carrier 26 due to the motion of the bandI are taken up by the upper portion of the carrier owing to theelasticity thereof, without transferring them to the stirrup 56 and thesupport 54. In consequence thereof, a frictional movement of the prongs58 of the stirrup 56 with respect to the support 54 is avoided. Itshould be understood that this arrangement is rendered possible by thesmall range of the carriers tilting motion limited by catching of theband slipped off the pulley of the band I0 because the kinetic energy ofthe pulley I2 to be taken up by the carrier rod 26 is relatively small.Further more as the carrier rod 2 6 makes only small angular or rockingmovements the recess 52 in the support 54 can be kept small so that thewidth thereof only slightly exceeds the diameter of the carrier rod 26.In this way the position of the carrier rod 26 is secured against beingwrongly mounted and changes during the operation of the machine areprevented. The inclination of the tensioning pulley I2 is adjustedaccording to the requirement of the machine and the carrier 26 isconnected to the support 54 by means of the stirrup 56. In consequencethereof the carrier rod 26 can be easily exchanged.

Referring now to Figs. 3 and 4 of the drawing the upper part of acarrier is designed in the same manner as shown in Fig. 1. In theembodiment shown in Fig. 3, the carrier I50 ends substantially levelwith the support 54 to which it is connected by a substantiallyhorizontal stirrup-like member 64 having bent-01f ends 66 arranged inconical holes or recesses 68 provided parallel to each other in theupper side of the support 54 substantially at right angles to the axisthereof. The size and shape of the holes 68 define the limits of theangular deviations of the carrier I50. In order to keep the bandtensioned a helical spring 70 is arranged on the support 54 having acircular cross section and embraces with one end I2 thereof the carrierI50. By this arrangement the end 66 of the stirrup 64 moves within theholes or recesses 68 only at larger rocking movements of the carrier I50whereas smaller movements are taken up by the resilient part of thecarrier I50 (not shown in Figs. 3 and 6).

The operation of this device is substantially the same as that of thedevice shown in Figs. 1 and 2.

Referring now to Figs. 5 and 6, the machine includes a support shaped asa stationary angle iron I4 to which is connected a bracket I6 by meansof screw bolts I8 and nuts 80. The bracket 16 has a recess 82 at the midportion of the arm thereof which is secured to the angle iron III foraccommodation of the lower part of a carrier I52. Since this part isinclined to the vertical a substantially U-shaped member 84 is arrangedbetween the lower part of the carrier I52 and vertical portion of theangle iron I4. The lower end 86 of the carrier I52 is bent off and in asubstantially horizontal position. The latter is provided with a shortcylindrical member 08 arranged opposite to a corresponding cylindricalmember 90 arranged at the upper leg of the bracket I6. A helical spring92 is interposed between the end 86 of the carrier I52 and the upper legof the 4 bracket I6 and held in position by the cylindrical members 88and 90 which have a slightly smaller diameter than the helix of thespring 92. The vertical leg of the angle iron I4 is provided at itsupper end with a shoulder 94 the sides of which serve as abutments forlimiting the angular or rocking movements of the carrier I52 byabutting, respectively, against the member 04.

The operation of this device is substantially the same as that of thepreviously described embodiments. The spring 92 serve for maintainingthe tension of the band (not shown) by acting on the carrier I52carrying the tensioning pulley (not shown in Figs. 5 and 6).

Referring now to the embodiment shown in Figs. 7, 8 and 9, the midportion I56 of a carrier I54 is connected by means of rivets I00 to amember I02 having lateral prongs I04 embracing the supporting rod 54.Between the prongs I04 is arranged an intermediate member I06 which issecured to the support 54 by means of a pin I08. The lower end of thecarrier I54 carries a weight (not shown) similar to the weight 62 inFig. 1.

The operation of this device is substantially the same as that of theembodiments shown in the other figures except that the member I02 limitsthe angular or rocking movements of the carrier I54 by striking againstthe intermediate member I06.

Referring now to Figs. 10 to 12, a support shaped as an angle iron I4 isconnected by means of screw bolts I8 and nuts to a bracket-like memberIIO having a curved lower end H2 and a substantially horizontal upperleg I I4 provided with a substantially rectangular hole II6 the oppositesides of which parallel to the angle iron 14' form abutments for acarrier II8 consisting of bent steel connected by an elastic portion I20acting as a spring, and a straight leg I22 to the bracket H0 and theangle iron I4. The leg I22 is provided with two holes for the screwbolts 18'. Thus it will be seen that the elastic carrier H8 is firmlyheld between the bracket H0 and the angle iron I4 if the nuts 80 on thescrew bolt 18' are tightened. The upper end of the carrier 8 is rivetedby means of rivets I24 to a plate-like member I26 having an extensionI28 which is angularly displaced with respect to the plate I26 and isprovided with an oblong hole I30 for attachment of the holder (notshown) of the tensioning pulley (not shown).

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types ofholders for tensioning pulleys differing from the types described above.

While I have illustrated and described the invention as embodied in aholder for tensioning pulleys in textile machines, I do not intend to belimited to the details shown, since various modifications and structuralchanges may be made without departing in any way from the spirit of myinvention.

Without further analysis, the foregoing will so fully reveal the gist ofmy invention that others can by applying current knowledge readily adaptit for various applications without omitting features that, from thestandpoint of prior art, fairly constitute essential characteristics ofthe generic or specific aspects of this invention, and, therefore, suchadaptations should and are intended to be comprehended within themeaning and range of equivalence of the following claims.

It is to be understood that the term band as used in the specificationand claims, includes other forms of power transmission means, as e. g.belts, tapes and the like.

What I claim a new and desire to secure by Letters Patent is:

. 1. A band tensioning and guiding device, comprising, in combination, asupport member; an elongated carrier member forming a double-arm leverpivotally mounted intermediate its ends on said support member forturning about a first axis, the portion of said carrier member on oneside of said first axis constituting one arm of said double-arm leverand being resilient for vibration in the plane of turning of saidcarrier member, and the remaining portion of said carrier on the otherside of said first axis constituting the other arm of said double-armlever; pulley means mounted on said elongated carrier member at the freeend of said resilient portion thereof for rotation about a second axissubstantially. parallel to said first axis, said pulley means beingadapted to engage a moving band for guiding the same; and urging meanson said remaining portion of said elongated carrier member tending toturn said carrier member about said'first axis so as to urge said pulleymeans in the direction of turning for tensioning a band engaged by saidpulley means, whereby said resilient portion of said carrier membercarrying said pulley means is free to slightly vibrate due to slightchanges in tension of the engaged band without interference by saidurging means which does not similarly vibrate due to the inherentinertia of said urging means and said remaining portion of said carriermember.

2. .A band tensioning and guiding device, comprising, in combination, asupport member; an elongated carrier member forming a double-arm leverpivotally mounted intermediate its ends on said support member forturning about a first axis, the portion of said carrier member on oneside of said first axis constituting one arm of said double-arm leverand being resilient for vibration in the plane of turning of saidcarrier member, and the remaining portion of said carrier member "on theother side of said first axis constituting the other arm of saiddoublearm lever, said resilient portion having a leading side facing inone direction of turning of said carrier member and a trailing sidefacing in the opposite direction; attaching means on said carrier memberconnected thereto in the region of the free end of said resilientportion thereof and extending laterally thereof on said trailing side;pulley means arranged on said trailing side of said carrier membermounted on said attaching means for rotation about a, second axissubstantially parallel to said first axis, said pulley means beingadapted to engage a moving band for guiding the same; and urging meanson said remaining portion of said elongated carrier member tending toturn said carrier member about said first axis so as to urge said pulleymeans in the direction of turning for tensioning a band engaged by saidpulley means, whereby said, resilient portion of said carrier membercarrying said pulley means is free to slightly vibratedue to slightchanges in tension of the engaged band Without interference by saidurging means which does not similarly vibrate due to the inherentinertia of said urging means and said remaining portion of said carriermember.

3. A band tensioning and guiding device, comprising, in combination, asupport member; an

elongated carrier member forming a double-arm lever pivotally mountedintermediate its ends on said support member for turning about a firstaxis, the portion of said carrier member on one side of said first axisconstituting one arm of said double-arm lever and being resilient forvibration in the plane of turning of said carrier member, and theremaining portion of said carrier member on the other side of said firstaxis constituting the other arm of said double-arm lever, said resilientportion having a leading side facing in one direction of turning of saidcarrier member and a trailing side facing in the opposite direction,said remaining portion extending laterally of said carrier member on thesame side as said leading side; attaching means on said carrier memberconnected thereto in the region of the free end of said resilientportion thereof and extending laterally thereof on said trailing side;pulley means arranged on said trailing side of said carrier membermounted on said attaching means for rotation about a second axissubstantially parallel to said first axis, said pulley means beingadapted to engage a moving band for guiding the same; and urging meanson said remaining portion of said elongated carrier member tending toturn said carrier member about said first axis so as to urge said pulleymeans in the direction of turning for tensioning a band engaged by saidpulley means, whereby said resilient portion of said carrier membercarrying said pulley means is free to slightly vibrate due to slightchanges in tension of the engaged band Without interference by saidurging means which does not similarly vibrate due to the inherentinertia of said urging means and said remaining portion of said carriermember.

4. A band tensioning and guiding device, comprising, in combination, asupport member; an elongated carrier member forming a double-arm leverpivotally mounted intermediate its ends on said support member forturning about a first axis, the portion of said carrier in mber on oneside of said first axis constituting one arm of said double-arm leverand being resilient for vibration in the plane of turning of saidcarrier member, and the remaining portion of said carrier member on theother side of said first axis constituting the other arm of saiddouble-arm lever, said resilient portion having a leading side facing inone direction of turning of said carrier member and a trailing sidefacing in the opposite direction; a U-shaped attaching member having apair of leg portions and a mid-portion connecting said leg portions,said attaching member being connected at its mid-portion to said carriermember in the region of the free end of said resilient portion thereofand extending laterally thereof on said trailing side, the free end ofone of said leg portions being bent inwardly to form a band-catchingmember; pulley means arranged on said trailing side of said carriermember mounted between said legs of said attaching member and on theother of said legs thereof for rotation about a second axissubstantially parallel to said first axis, said pulley means beingadapted to engage a moving band for guiding the same; and urging meanson said remaining portion of said elongated carrier member tending toturn said carrier member about said first axis so as to urge said pulleymeans in the direction of turning for tensioning a band engaged by saidpulley means, whereby said resilient portion of said carrier membercarrying said pulley means is free to slightly vibrate due to slightchanges in tension of the engaged band without interference by saidurging means which does not similarly vibrate due to the inherentinertia of said urging means and said remaining portion of said carriermember.

5. A band tensioning and guiding device, comprising, in combination, asupport member; an elongated carrier member forming a double-arm leverpivotally mounted intermediate its ends on said support for turningabout a first axis, the portion of said carrier member on one side ofsaid first axis constituting one arm of said double-arm lever and beingresilient for vibration in the plane of turning of said carrier member,and the remaining portion of said carrier member on the other side ofsaid first axis constituting the other arm of said double-arm lever,said resilient portion having a leading side facing in one direction ofturning of said carrier member and a trailing side facing in theopposite direction; a U-shaped attaching member having a pair of legportions and a mid-portion connecting said leg portions, said attachingmember being connected at its mid-portion to said carrier member in theregion of the free end of said resilient portion thereof and extendinglaterally thereof on said trailing side, the free end of one of said legportions being bent inwardly to form a band-catching member; pulleymeans arranged on said trailing side of said carrier member mountedbetween said legs of said attaching member and on the other of said legsthereof for rotation about a second axis substantially parallel to saidfirst axis, said pulley means being adapted to engage a moving band forguiding the same, the band-catching member being arranged between saidsecond axis and the periphery of the pulley means nearest said carriermember; and urging means on said remaining portion of said elongatedcarrier member tending to turn said carrier member about said first axisso as to urge said pulley means in the direction of turning fortensioning a band engaged by said pulley means, whereby said resilientportion of said carrier member carrying said pulley means is free toslightly vibrate due to slight changes in tension of the engaged handwithout interference by said urging means which does not similarlyvibrate due to the inherent inertia of said urging means and saidremaining portion of said carrier member.

6. A band tensioning and guiding device, comprising, in combination, asupport member; an elongated carrier member forming a double-arm leverpivotally mounted intermediate its ends on said support member forturning about a substantially horizontal first axis, the portion of saidcarrier member on one side of said first axis constituting one arm ofsaid double-arm lever and being resilient for vibration in the plane ofturning of said carrier member, and the remaining portion of saidcarrier member on the other side of said first axis constituting theother arm of said double-arm lever; pulley means mounted on saidelongated carrier member at the free end of said resilient portionthereof for rotation about a second axis substantially parallel to saidfirst axis, said pulley means being adapted to engage a moving band forguiding the same; and counter-weight means on said remaining portion ofsaid elongated carrier member tending to turn said carrier member aboutsaid first axis so as to urge said pulley means in the direction ofturning for tensioning a band engaged by said pulley means, whereby saidresilient portion of said carrier member carrying said pulley means isfree to slightly vibrate due to slight changes in tension of the engagedband without interference by said counter-Weight means which does notsimilarly vibrate due to the inherent inertia of said counter-weightmeans and said remaining portion of said carrier member.

7. A band tensioning and guiding device, comprising, in combination, asupport member; an elongated carrier member forming a double-arm leverpivotally mounted intermediate its ends on said sup-port member forturning about a substantally horizontal first axis, the portion of saidcarrier member on one side of said first axis constituting one arm ofsaid double-arm lever and being resilient for vibration in the plane ofturning of said carrier member, and the remaining portion of saidcarrier member on the other side of said first axis constituting theother arm of said double-arm lever, said resilient portion having aleading side facing in one direction of turning of said carrier memberand a trailing side facing in the opposite direction; a U-shapedattaching member having a pair of leg portions and a mid-portionconnecting said leg portions, said attaching member being connected atits mid-portion to said carrier member in the region of the free end ofsaid resilient portion thereof and extending laterally thereof on saidtrailing side, the free end of one of said leg portions being bentinwardly to form a band-catching member; pulley means arranged on saidtrailing side of said carrier member mounted between said legs of saidattaching member and on the other of said legs thereof for rotationabout a second axis substantially parallel to said first axis, saidpulley means being adapted to engage a moving band for guiding the same,the bandcatching member being arranged between said second axis and theperiphery of the pulley means nearest said carrier member; andcounter-weight means on said remaining portion of said elongated carriermember tending to turn said carrier member about said first axis so asto urge said pulley means in the direction of turning for tensioning aband engaged by said pulley means, whereby said resilient portion ofsaid carrier member carrying said pulley means is free to slightlyvibrate due to slight changes in tension of the engaged band withoutinterference by said counter-weight means which does not similarlyvibrate due to the inherent inertia of said counter-weight means andsaid remaining portion of said carrier member.

8. A band tensioning .and guiding device, comprising, in combination,'asupport member; an elongated carrier member forming a double-arm leverpivotally mounted intermediate its ends on said support member forturning about a substantially horizontal first axis, the portion of saidcarrier member on one side of said first axis constituting one arm ofsaid double-arm lever and being resilient for vibration in the plane ofturning of said carrier member, and the remaining portions of saidcarrier member on the other side of said first axis being shorter thansaid first-mentioned portion and constituting the other arm of saiddouble-arm lever, said resilient portion having a leading side facing inone direction of turning of said carrier member and a trailing sidefacing in the opposite direction; a U-shaped attaching member having apair of leg portions and a mid-portion connecting said leg portions,said attaching member being connected at its mid-portion to said carriermember in the region of the free end of said resilient portion thereofand extending laterally thereof on said trailing side, the free end ofone or" said leg portions being bent inwardly to form a band-catchingmember; pulley means arranged on said trailing side of said carriermember mounted between said legs of said attaching member and on theother of said legs thereof for rotation about a second axissubstantially parallel to said first axis, said pulley means beingadapted to engage a moving band for guiding the same, the band-catchingmember being arranged between said second axis and the periphery of thepulley means nearest said carrier member; and counterweight means onsaid remaining portion of said elongated carrier member tending toturnsaid carrier member about said first axis so as to urge said pulleymeans in the direction of turning for tensioning a band engaged by saidpulley means,

whereby said resilient portion of said carrier member carrying saidpulley means is free to slightly vibrate due to slight changes intension of the engaged band without interference by said counter-weightmeans which does not similarly vibrate due to the inherent inertia ofsaid counter-weight means and said remaining portion of said carriermember.

9. A band tensioning and guiding device, comprising, in combination, asupport member; an elongated carrier member forming a double-arm leverpivotally mounted intermediate its ends on said support member forturning about a substantially horizontal first axis, the portion of saidcarrier member on one side of said first axis constituting one arm ofsaid double-arm lever and being resilient for vibration in the plane ofturning of said carrier member, and the remaining portion of saidcarrier member on the other side of said first axis constituting theother arm of said double-arm lever, said resilient portion having .aleading side facing in one direction of turning of said carrier memberand a trailing side facing in the opposite direction; a U-shapedattaching member having a pair of leg portions and a mid-portionconnecting said leg portions, said attaching member being connected atits mid-portion to said carrier member in the region of the free end ofsaid resilient portion thereof and extending laterally thereof on saidtrailing side, the free end of one of said leg portions being bentinwardly to form a band catching member; pulley means arranged on saidtrailing side of said carrier member mounted between said legs of saidattaching member on the other of said legs thereof for rotation about asecond axis substantially parallel to said first axis, said pulley meansbeing adapted to engage a moving band for guiding the same, theband-catching member being arranged between said second axis and theperiphery of the pulley means nearest said carrier member;counter-weight means on said remaining portion of said elongated carriermember tending to turn said carrier member about said first axis so asto urge said pulley means in the direction of turning for tensioning aband engaged by said pulley means; and stop means for limiting theturning of said carrier member about said first axis relative to saidsupport member, whereby said resilient portion of said carrier membercarrying said pulley means is free to slightly vibrate due to slightchanges in tension of the engaged band without interference by saidcounter-weight means which does not similarly vibrate due to theinherent inertia of said counter-weight means and said remaining portionof said carrier member.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 341,631 Baird May 11, 1886 403,048 Jones May 7, 1889 520,473Atherton May 29, 1894 853,371 Nims May 14, 1907 1,137,053 Cunningham et.al. Apr. 27, 1915 2,070,713 Dodd Feb. 16, 1937 2,297,250 Sato Sept. 29,1942 2,303,172 Nutting Nov. 24, 1942 2,329,159 Gwaltney et a1 Sept. 7,1943 FQREIGN PATENTS Number Country Date 213,366 Great Britain Apr. 3,1924 502,226 Great Britain Mar. 14, 1939 505,004 Great Britain May 3,1939 603,471 Germany Oct. 26, 1935

